Slip-on flanges


M-Pipe & Fitting Solution Inc is a reputable company that manufactures and supplies high-quality slip-on flanges. Slip-on flanges are used in piping systems to connect pipes, valves, and other equipment. They are designed to slide over the end of a pipe and then be welded in place. Slip-on flanges provide a strong and secure connection, making them popular in various industries, including oil and gas, petrochemical, chemical, power generation, and water treatment.

One of the critical advantages of slip-on flanges is their ease of installation. They can be easily aligned and welded to the pipe, reducing the time and effort required for installation compared to other flanges. It makes slip-on flanges a cost-effective option for many projects.

Various materials are used to manufacture slip-on flanges, with stainless steel, carbon steel, and duplex steel among the most common choices.

Stainless steel slip-on flanges are highly corrosion-resistant and have excellent mechanical properties. They are often used in applications with critical corrosion resistance, such as in the food and beverage industry, pharmaceutical industry, and offshore oil and gas installations. Stainless steel slip-on flanges are available in different grades, such as 304, 316, 316L, and 321, to suit specific requirements.

Carbon steel slip-on flanges are known for their strength and durability. They are commonly used in high-pressure and high-temperature applications, such as oil refineries, chemical plants, and power plants. Carbon steel slip-on flanges are available in various grades, such as ASTM A105 and ASTM A350 LF2, which provide different strength and temperature resistance levels.

Duplex steel slip-on flanges offer a combination of excellent corrosion resistance and high strength. Duplex steel is a family of stainless steel containing a balanced mixture of austenite and ferrite phases, resulting in improved mechanical properties and resistance to stress corrosion cracking. Duplex steel slip-on flanges are suitable for applications requiring corrosion resistance and strength, such as offshore and marine environments.

When selecting slip-on flanges, it is essential to consider factors such as pressure ratings, temperature limitations, and compatibility with the fluid or gas being conveyed. Flanges must be chosen based on the application’s specific requirements to ensure safe and reliable operation.

In addition to the material, slip-on flanges come in different sizes and dimensions to accommodate various pipe sizes. They are typically available in ANSI/ASME B16.5 and ASME B16.47 standards, which specify the dimensions, pressure ratings, and facing types of flanges.

The facing type of slip-on flanges refers to the surface finish of the flange where it makes contact with the gasket. The most familiar face types are raised face (RF) and flat face (FF). Raised face flanges have a raised surface around the bolt holes, which provides a sealing area for the gasket. On the other hand, flat flanges have a flat surface and require a full-face gasket to ensure a proper seal.

Slip-on flanges can also be customized with special coatings or linings to enhance their corrosion resistance or to provide specific properties. For example, flanges used in highly corrosive environments may be coated with materials like PTFE (polytetrafluoroethylene) or lined with rubber or PTFE to protect the flange and ensure a tight seal.

In conclusion, slip-on flanges are versatile and widely used in various industries for connecting pipes and equipment. They are available in different materials, such as stainless steel, carbon steel, and duplex steel, each offering unique properties suited for different applications. Proper selection of slip-on flanges based on material, size, facing type, and other factors are crucial to ensure safe and efficient operation in a piping system. It is always recommended to consult with industry experts or refer to relevant codes and standards when selecting slip-on flanges for a specific application.

The installation process of slip-on flanges is relatively straightforward. Here are the general steps involved:

Preparation: Ensure the pipe ends and flange surfaces are clean, smooth, and free from debris, rust, or contaminants. It will promote proper welding and ensure a secure connection.

Alignment: Align the slip-on flange with the pipe end, ensuring the bolt holes match correctly. The flange should slide over the pipe without any obstructions.

Tack Welding: Once aligned, tack weld the slip-on flange to the pipe at a few points. Tack welding helps to hold the flange in place during the final welding process.

Welding: Proceed with the final welding of the slip-on flange to the pipe. The welding process may involve techniques such as shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), or gas metal arc welding (GMAW), depending on the material and welding specifications.

Post-welding: After the welding is completed, perform necessary post-welding activities, such as cleaning the welds, inspecting for defects, and conducting non-destructive testing (NDT) if required.

It is crucial to follow industry best practices, welding procedures, and safety guidelines during the installation process to ensure the integrity and reliability of the connection.

Regarding maintenance, slip-on flanges are relatively easy to disassemble and reassemble, allowing convenient access to the pipeline for inspection, repair, or modification. Inspecting the flange and its welds is recommended to identify any signs of corrosion, leaks, or structural issues. If any defects are detected, appropriate measures should be taken to address them promptly.

In conclusion, slip-on flanges are vital in joining pipes and equipment in various industries. The choice of material, such as stainless steel, carbon steel, or duplex steel, depends on the application’s specific requirements, including factors like corrosion resistance, strength, and temperature limitations. Proper installation, welding, and maintenance practices are essential to ensure slip-on flanges’ long-term performance and safety in piping systems. M-Pipe & Fitting Solution Inc provides certified flanges that meet international standards such as API, ASTM, and ISO 9001:2015.

ASME B16.9 Slip on Flange DimensionsANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
ASME B16.5 SORF Plate Flanges Size1/2″ (15 NB) to 48″ (1200NB)


CLASSNominal Pipe SizeSocket Weld
150 lb½2


All information in our datasheet is grounded on approximate testing and is stated formal of our knowledge & belief.  It’s presented piecemeal from contractual scores and doesn’t constitute any guarantee of properties or of processing or operation possibilities in individual cases. Our guarantees and arrears are stated simply in our terms of trade.

  • Gas Processing Industry
  • Pharmaceuticals Industry
  • Chemical Industry
  • Pulp and Paper Industry
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers